Howe 1000-RLE Installation & Service Manual page 25

The Photoelectric sensors, or Photo Eyes, shoot
an infrared beam across the opening of the Ice
Flaker.
If this beam in interrupted for more than 15
seconds, the Ice Flaker will begin the Off‐Delay
Cycle. This prevents ice from filling into the ice
making area and damaging internal parts.
The Ice Flaker will return to Normal Operation
when the infrared beam is re‐established,
provided the Off‐Delay Cycle has completed.
If the Ice Flaker was purchased without an Ice
Bin the Photo Eyes will be shipped loose and
need to be properly mounted by the installing
contractor. Please contact Howe for further
information.
Water or Moisture in Molex Plug
If the Molex plug for either the Emitter or
Receiver is wet or has moisture in it, shake
water off plug and dry properly.
Molex plug must be re‐packed with Di‐electric
grease every time it is unplugged to maintain
water resistance.
Correct Wiring Arrangement
The Emitter should have only the blue & brown
wires connected to it. There should not be any
pin in the center position on the Molex
connector attached to the Emitter.
The Receiver should have the blue, brown &
black wires connected.
Correct Voltage
With Level Control Relay plugged in and power
to Ice Flaker on, unplug Emitter and Receiver.
Use a voltmeter to verify 24 volts across blue
and brown pins. Alternatively you can check
terminals #1 and #10 on the Level Control
Relay.
If 24 volts is not present, the Level Control Relay
has likely failed and needs to be replaced.
Sequence of Operation
There are Light‐Emitting Diode (LED) indicators
on the rear of both the Emitter & Receiver.
The Emitter has a green LED, which is
illuminated whenever the Ice Flaker has power.
The Receiver has two LEDs. The green LED is
always illuminated whenever the Ice Flaker has
power. The amber LED is illuminated when it
"sees" the infrared signal from the Emitter.
During Normal Operation, all LEDs should be lit.
The Level Control Relay (LC1) should open the
Solenoid Valve, and the Ice Flaker should begin
making ice.
When the infrared beam is blocked, both green
LEDs will remain lit. However, the amber LED
on the Receiver will go out.
After 15 seconds of the beam being blocked,
the Solenoid Valve will de‐energize and the Off‐
Delay Cycle will begin.
Depending upon the adjustment of the Off‐
Delay Setting, the Driver Motor and Water
Pump will continue to operate for between 2 –
30 minutes.
If the Photo Eyes do not operate in this fashion,
please consult the Troubleshooting section.
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